547
FNCA52 TJSJ 220901
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
501 AM AST THU JAN 22 2026
DISCUSSION
A SURFACE TROUGH WILL MOVE OVER THE AREA TODAY, INCREASING
MOISTURE AND SHOWER ACTIVITY, RESULTING IN A VARIABLE WEATHER
PATTERN. HOWEVER, SOME BRIEF PERIODS OF LOWER RELATIVE HUMIDITY
ARE EXPECTED OVER USUAL AREAS, WITH VALUES DROPPING INTO THE
MID-40S TO LOWER 50S. SUSTAINED WINDS UP TO 15 TO 20 KNOTS, WITH
HIGHER GUSTS, WILL CONTINUE, PARTICULARLY ACROSS THE SOUTHERN
COASTAL PLAINS. DESPITE PERIODIC INCREASES IN MOISTURE AND
POSSIBLE AFTERNOON CONVECTION NEAR THE AREA, FUELS REMAIN ON THE
DRIER SIDE, SUPPORTING FAVORABLE FIRE- WEATHER DISPERSION. FIRE
WEATHER CONDITIONS WILL REMAIN LOW TODAY.
PRZ014-230915-
SOUTHEAST COASTAL PLAINS-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 50
TEMP (24H TREND) 87 (+2) 70 (-2) 87
RH % (24H TREND) 49 (-5) 86 (+1) 52
WIND 20FT/EARLY(MPH) E 19 G25 E 13 G17 E 16 G22
WIND 20FT/LATE(MPH) E 19 G25 E 13 G17 E 16 G22
MIXING HGT(FT-AGL/MSL)5250 4940
TRANSPORT WND (MPH) E 20 E 15
VENT RATE (KT-FT) 89250 64220
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-230915-
SOUTHERN HILLS-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 60
TEMP (24H TREND) 83 (+3) 67 (-3) 83
RH % (24H TREND) 62 (-3) 94 (+6) 65
WIND 20FT/EARLY(MPH) E 16 E 13 E 12
WIND 20FT/LATE(MPH) E 16 E 13 E 12
MIXING HGT(FT-AGL/MSL)5650 5360
TRANSPORT WND (MPH) E 20 E 15
VENT RATE (KT-FT) 96050 69680
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-230915-
NORTH COASTAL PLAINS-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 50
TEMP (24H TREND) 85 (0) 70 (-1) 85
RH % (24H TREND) 65 (0) 98 (+2) 67
WIND 20FT/EARLY(MPH) E 21 G23 E 20 E 17 G20
WIND 20FT/LATE(MPH) E 21 G23 E 20 E 17 G20
MIXING HGT(FT-AGL/MSL)4740 4790
TRANSPORT WND (MPH) E 22 E 17
VENT RATE (KT-FT) 90060 71850
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-230915-
NORTHERN HILLS-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 60 40 70
TEMP (24H TREND) 85 (+2) 67 (-2) 85
RH % (24H TREND) 63 (-1) 98 (+1) 65
WIND 20FT/EARLY(MPH) E 19 E 17 E 16
WIND 20FT/LATE(MPH) E 19 E 17 E 16
MIXING HGT(FT-AGL/MSL)5170 5070
TRANSPORT WND (MPH) E 20 E 15
VENT RATE (KT-FT) 87890 65910
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-230915-
WEST COAST-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 40 70
TEMP (24H TREND) 87 (+1) 68 (-2) 87
RH % (24H TREND) 60 (-2) 95 (+5) 63
WIND 20FT/EARLY(MPH) E 16 G18 E 16 E 12
WIND 20FT/LATE(MPH) E 16 G18 E 16 E 12
MIXING HGT(FT-AGL/MSL)5220 4960
TRANSPORT WND (MPH) E 16 E 10
VENT RATE (KT-FT) 73080 44640
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-230915-
EASTERN INTERIOR-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 60 60
TEMP (24H TREND) 84 (+2) 69 (-2) 84
RH % (24H TREND) 68 (+2) 97 (+4) 70
WIND 20FT/EARLY(MPH) E 17 E 16 E 12
WIND 20FT/LATE(MPH) E 17 E 16 E 12
MIXING HGT(FT-AGL/MSL)4640 5140
TRANSPORT WND (MPH) E 21 E 15
VENT RATE (KT-FT) 83520 66820
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-230915-
LUQUILLO MOUNTAIN RANGE-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 70
TEMP (24H TREND) 79 (+1) 67 (-3) 79
RH % (24H TREND) 71 (0) 99 (+4) 73
WIND 20FT/EARLY(MPH) E 14 E 12 E 11
WIND 20FT/LATE(MPH) E 14 E 12 E 11
MIXING HGT(FT-AGL/MSL)3560 3800
TRANSPORT WND (MPH) E 22 E 16
VENT RATE (KT-FT) 67640 53200
DISPERSION 5 5
DSI 6 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-230915-
CENTRAL MOUNTAIN RANGE-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 20 70
TEMP (24H TREND) 83 (+4) 65 (-2) 83
RH % (24H TREND) 62 (-4) 97 (+3) 65
WIND 20FT/EARLY(MPH) E 13 E 13 E 9
WIND 20FT/LATE(MPH) E 13 E 13 E 9
MIXING HGT(FT-AGL/MSL)5710 5570
TRANSPORT WND (MPH) E 17 E 13
VENT RATE (KT-FT) 85650 61270
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-230915-
CAYEY MOUNTAIN RANGE-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 70 60 60
TEMP (24H TREND) 79 (+1) 68 (-1) 79
RH % (24H TREND) 73 (+2) 97 (+3) 75
WIND 20FT/EARLY(MPH) E 13 E 11 E 11
WIND 20FT/LATE(MPH) E 13 E 11 E 11
MIXING HGT(FT-AGL/MSL)4050 4480
TRANSPORT WND (MPH) E 22 E 16
VENT RATE (KT-FT) 76950 62720
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-230915-
VIEQUES-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 70
TEMP (24H TREND) 85 (-1) 71 (-3) 85
RH % (24H TREND) 60 (+1) 98 (+8) 62
WIND 20FT/EARLY(MPH) E 20 G24 E 18 G23 E 14 G18
WIND 20FT/LATE(MPH) E 20 G24 E 18 G23 E 14 G18
MIXING HGT(FT-AGL/MSL)3630 3370
TRANSPORT WND (MPH) E 29 E 20
VENT RATE (KT-FT) 90750 57290
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-230915-
CULEBRA-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 60 70 70
TEMP (24H TREND) 84 (-2) 73 (-2) 84
RH % (24H TREND) 65 (+3) 98 (+8) 66
WIND 20FT/EARLY(MPH) E 20 G25 E 18 G23 E 14 G18
WIND 20FT/LATE(MPH) E 20 G25 E 18 G23 E 14 G18
MIXING HGT(FT-AGL/MSL)3630 3330
TRANSPORT WND (MPH) E 29 E 20
VENT RATE (KT-FT) 90750 56610
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-230915-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 50
TEMP (24H TREND) 88 (+2) 69 (-2) 88
RH % (24H TREND) 48 (-4) 87 (+2) 50
WIND 20FT/EARLY(MPH) E 23 G29 E 21 G26 E 18 G23
WIND 20FT/LATE(MPH) E 23 G29 E 21 G26 E 18 G23
MIXING HGT(FT-AGL/MSL)5650 5360
TRANSPORT WND (MPH) E 18 E 14
VENT RATE (KT-FT) 90400 64320
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-230915-
SAINT THOMAS AND SAINT JOHN-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 50 70 70
TEMP (24H TREND) 85 (0) 69 (-4) 84
RH % (24H TREND) 64 (+1) 100 (+5) 66
WIND 20FT/EARLY(MPH) E 20 G25 E 19 G23 E 16 G20
WIND 20FT/LATE(MPH) E 20 G25 E 19 G23 E 16 G20
MIXING HGT(FT-AGL/MSL)3650 3350
TRANSPORT WND (MPH) E 29 E 21
VENT RATE (KT-FT) 91250 60300
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-230915-
ST CROIX-
501 AM AST THU JAN 22 2026
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 70 60 70
TEMP (24H TREND) 86 (0) 75 (-1) 85
RH % (24H TREND) 63 (0) 90 (+6) 67
WIND 20FT/EARLY(MPH) E 19 G23 E 18 G22 E 14 G19
WIND 20FT/LATE(MPH) E 19 G23 E 18 G22 E 14 G19
MIXING HGT(FT-AGL/MSL)3940 3990
TRANSPORT WND (MPH) E 28 E 21
VENT RATE (KT-FT) 94560 71820
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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